Title: Nanostructured thin films of Ba doped In2O3 for selectively monitoring trace levels of NOx

Authors: Chander Shekhar, K.I. Gnanasekar, E. Prabhu, V. Jayaraman, T. Gnanasekaran

Addresses: Liquid Metals and Structural Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India. ' Liquid Metals and Structural Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India. ' Liquid Metals and Structural Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India. ' Liquid Metals and Structural Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India. ' Liquid Metals and Structural Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India

Abstract: Nanostructured thin films of Ba-doped indium oxide have been examined for monitoring ppm levels of NOx in ambient air, and their response patterns have been recorded at different operating conditions. These films are found to be capable of sensing down to 0.5 ppm NOx concentration in air. The optimum operating temperature for sensing is found to be 300°C. Response and retrace times are typically 60 s and 300 s respectively. They are highly selective to NOx and do not show significant response to hydrogen and petroleum gas up to 5000 ppm.

Keywords: NOx sensing; In2O3 thin films; pulsed laser deposition; nitrogen oxides; nanostructures; nanotechnology; indium oxide; nitric oxide; nitrogen dioxide; barium; NOx monitoring.

DOI: 10.1504/IJNT.2010.034708

International Journal of Nanotechnology, 2010 Vol.7 No.9/10/11/12, pp.1038 - 1046

Published online: 17 Aug 2010 *

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